Des Moines River IA 04-UDM-1212
from the Interstate 80/35 bridge (S17 T79N R24W Polk Co.) to Saylorville Dam in S30 T80N R24W Polk Co.
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 2 - Some of the designated uses are met but there is insufficient data to determine if remaining designated uses are met.
- Trend
- Stable
- Created
- 11/1/2023 8:13:03 AM
- Updated
- 12/29/2023 1:31:41 PM
The presumptive Class A1 use was assessed as "fully supported" based on indicator bacteria and pH monitoring. The Class BWW1 use was assessed as "WINOFI” based on biological sampling data. The Class C (drinking water) use was assessed as "fully supported" based on water quality monitoring data. The Class HH (fish consumption) use was assessed as "fully supported" based on fish tissue sampling data. Note: A TMDL for the nitrate impairment in this segment was approved by EPA in September 2009. The TMDL covered the nitrate impairment identified for this segment and the impairment remained in IR Category 4a (impaired; TMDL approved) until this cycle. However, the 2018-2020 nitrate monitoring data indicated "full support."
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description USACE 12 WQ CY 2020-2022 17770001 Des
Moines River at 66th. St. Site
5 USACE 12 FT See Below 17770001 Des
Moines River at 66th. St. Site
5 Iowa DNR 6 BIO See Below 917 Des
Moines River Des
Moines – US1 Site ID Data Source ID # Samples per Year (2020/ 2021/2022) 2020 Geometric Mean 2021 Geometric Mean 2022 Geometric Mean Violates Annual Geometric Mean? # 2020 SSM violations / SSM Violations needed for impairment # 2021 SSM violations / SSM Violations needed for impairment # 2022 SSM violations / SSM Violations needed for impairment Violates Annual SSM Significantly >10% Rule? Assessment Type Support Level 17770001 12 10/10/10 13 8 16 NO 1 / 3 0 / 3 0 / 3 NO Mon Full Site ID Data Source ID # Samples / # Years Minimum Value Maximum Value Mean Value # Violations Violations needed for impairment Violates Significantly >10% Rule? Assessment Type Support Level 17770001 12 60 / 3 6.06 9.69 8.22 4 10 NO Mon Full Site ID Data Source ID Parameter Name # Samples / # Years Minimum Value Maximum Value Mean Value # Violations # Acute / Chronic Violations Violations needed for impairment Violates Significantly >10% Rule? Assessment Type Support Level 17770001 12 Dissolved Oxygen 60 / 3 7.23 15.03 10.95 0 NA / NA 10 NO Mon Full 17770001 12 pH 60 / 3 6.06 9.69 8.22 4 NA / NA 10 NO Mon Full 17770001 12 Temperature 60 / 3 1.8 29.4 15.8 0 NA / NA 10 NO Mon Full 17770001 12 Total suspended solids 60 / 3 0.005 50 17.468 NA 0 / 0 NULL NO Mon Full Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value # Acute / Chronic Violations >1 Acute / Chronic Violation Assessment Type Support Level 17770001 12 Ammonia 19 / 1 0.03 0.01 0 0 / 0 NO Mon Full Benthic Macroinvertebrates: Site
ID Date Drainage
Area (mi2) Ecoregion Major
Drainage BM
Sample Gear BMIBI
score BMIBI
Class 47b
BMIBI BIT BMIBI
Pass/Fail 917 9/17/14 5840 47b MS Floating
Art Sub 29 Poor 62 Fail Community Assessment
Type Assessment
Result Support
Level IR
Category Reason Benthic Macroinvertebrates Evaluated Fail
(0/1) WINOFI Assessment was evaluated because the
drainage area Overall Evaluated Fail WINOFI 3bu of the site is greater than the calibrated
range. Site ID Data Source ID Parameter Name # Samples / # Years Minimum Value Maximum Value Mean Value Median Value # Violations Violates Significantly >10% Rule? Assessment Type Support Level 17770001 12 Inorganic nitrogen (nitrate and nitrite) 60 / 3 0.1 11.4 2.9 1.7 1 NO Mon Full 17770001 12 pH 60 / 3 6.06 9.69 8.22 8.27 4 NO Mon Full Site ID Biopart Year Species # in sample / # of samples Avg Length (cm) (Avg) Hg (ppm) Chlordane (ppm) Sum PCBs (ppm) 17770001 whole 2016 common carp 5 NA NA 0.03 <0.06 17770001 fillet 2016 largemouth bass 2 NA 0.11 Support Level Full Evaluated
Class A1 - Indicator Bacteria:
Class A1 – pH:
Class BWW1 - Binomial Parameters:
Class BWW1 - Toxic Parameters:
Class BWW1 - Biological Sampling:
Overall:
Class C - Binomial Parameters:
Class HH - Fish Tissue Sampling: